By George Burba, Dan Anderson
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1992) As with any new fast instrument, open-path or closed-path, it is important to validate its frequency response, using actual field data, especially if the sampling path is relatively large. Co-spectral corrections for LI-7700 were still viable at this height, but such low heights are not recommended for Eddy Covariance measurements for any sensor. Ensemble averages of normalized midday cospectra are plotted above versus non-dimensional frequency for 5 contrasting ecosystems and setups. 75 m, CH4 flux co-spectra behaved similar to CO2 cospectra from LI-7500, and were close to that of sonic temperature.
Given a sinusoidal oscillation of concentration, the instrument's ability to measure the full os- The bandwidth selection has no impact on the system delay. The filters were designed so they have exactly the same delay whether a 5, 10, or 20 Hz signal bandwidth is selected. Bandwidth setting of 5, 10 or 20 Hz indicates a minimum sampling rate of 10, 20 and 40 Hz respectively. , 2001). Prior measurements of CH4 fluxes have mostly been made with chambers, and with Eddy Covariance approach via closed-path analyzers.
However, the single length is too restrictive to apply to all studies because a specific study may require a specific tube length. 0 m, or less) to reduce uncertainties associated with the effects of long intakes on water vapor fluctuations. 7 m, or more) to further reduce or eliminate temperature fluctuations and associated uncertainties. 7 m, the water attenuation can still be corrected by frequency response corrections, so no actual water vapor flux would be lost, but uncertainty will increase.